Molybdenum

City of Napa

Molybdenum is a metal that occurs naturally in soil, minerals and water. People who ingest large amounts can have increased levels of uric acid and gout-like symptoms.

MORE ABOUT THIS CONTAMINANT

Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2013	0.283 ppb	12	3	ND - 1.30 ppb
2014	ND	3	0	ND
2015	ND	3	0	ND
2016	ND	1	0	ND
2017	ND	3	0	ND
2018	ND	2	0	ND
2019	ND	2	0	ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 40 ppb

The EWG Health Guideline of 40 ppb for molybdenum was defined by the Environmental Protection Agency as a benchmark for testing under the Unregulated Contaminant Monitoring Rule program. This health guideline protects against metabolic changes and excess formation of uric acid in the blood.

ppb = parts per billion

All test results

Date	Lab ID	Result
2013-02-06	1302098-001A	1.30 ppb
2013-02-27	1302775-001A	1.10 ppb
2013-06-05	1306140-001A	ND
2013-06-05	1306141-001A	ND
2013-07-10	1307416-001A	ND
2013-07-10	1307419-001A	ND
2013-07-10	1307417-001A	ND
2013-07-10	1307418-001A	ND
2013-10-03	1310113-001A	1.000 ppb
2013-10-03	1310112-001A	ND
2013-10-03	1310114-001A	ND
2013-10-03	1310111-001A	ND
2014-07-09	1233-007-0925	ND
2014-07-09	1233-006-1245	ND
2014-07-09	1233-005-1145	ND
2015-07-21	1233-005-1120	ND
2015-07-21	1233-007-0940	ND
2015-07-21	1233-006-1415	ND
2016-07-27	1233-006-1545	ND
2017-07-20	1233-007-1050	ND
2017-07-20	1233-006-1330	ND
2017-09-13	1233-005-0840	ND
2018-07-11	1233-007-1200	ND
2018-07-11	1233-006-1015	ND
2019-07-10	1233-007-0830	ND
2019-07-10	1233-006-1200	ND